@charset "utf-8";
#a{
	width: 800px;
	height: 800px;
	margin-left: auto;
	margin-right: auto;
}
#b{
	width: 800px;
	height: 200px;
	background-color: #ccc;
}
#c{
	width: 800px;
	height: 500px;
	background-color: #DFAEC7;
}
#d{
	width: 800px;
	height: 100px;
	background-color: #ccc;
}